In connection with the judiciary system reforming and changes in socio-political life of our state, the adversarial principle has gained a new resonance on the grounds that the judicial and legal reform is directly linked to adversariality. The reform of the criminal procedure law must be based on solid theoretical foundation. However, adversariality, as legal concept, is not enough investigated in the doctrine of the criminal procedure law. Currently, notorious specialists in the field of criminal procedure law examine and study the importance of fundamentals and basic principles of the criminal process and, primarily, its adversariality. The Criminal Procedure Law of the Republic o fMoldovais advancing and developing through democratization and widening of adversariality beginnings in justice rendering. This is natural and, as adversariality has enormous significance for the entire system of criminal proceedings, largely determining the legal status and relations between the participants in criminal proceedings and the legal relationships between the parties to the proceedings and the court.